//! Functions for managing engine communications.

pub mod async_tasks;
#[cfg(not(target_arch = "wasm32"))]
#[cfg(feature = "engine")]
pub mod conn;
pub mod conn_mock;
#[cfg(target_arch = "wasm32")]
#[cfg(feature = "engine")]
pub mod conn_wasm;

use std::{
    collections::HashMap,
    sync::{
        Arc,
        atomic::{AtomicUsize, Ordering},
    },
};

pub use async_tasks::AsyncTasks;
use indexmap::IndexMap;
use kcmc::{
    ModelingCmd, each_cmd as mcmd,
    length_unit::LengthUnit,
    ok_response::OkModelingCmdResponse,
    shared::Color,
    websocket::{
        BatchResponse, ModelingBatch, ModelingCmdReq, ModelingSessionData, OkWebSocketResponseData, WebSocketRequest,
        WebSocketResponse,
    },
};
use kittycad_modeling_cmds::{self as kcmc, units::UnitLength};
use parse_display::{Display, FromStr};
use serde::{Deserialize, Serialize};
use tokio::sync::RwLock;
use uuid::Uuid;
use web_time::Instant;

use crate::{
    SourceRange,
    errors::{KclError, KclErrorDetails},
    execution::{DefaultPlanes, IdGenerator, PlaneInfo, Point3d},
};

lazy_static::lazy_static! {
    pub static ref GRID_OBJECT_ID: uuid::Uuid = uuid::Uuid::parse_str("cfa78409-653d-4c26-96f1-7c45fb784840").unwrap();

    pub static ref GRID_SCALE_TEXT_OBJECT_ID: uuid::Uuid = uuid::Uuid::parse_str("10782f33-f588-4668-8bcd-040502d26590").unwrap();

    pub static ref DEFAULT_PLANE_INFO: IndexMap<PlaneName, PlaneInfo> = IndexMap::from([
            (
                PlaneName::Xy,
                PlaneInfo {
                    origin: Point3d::new(0.0, 0.0, 0.0, Some(UnitLength::Millimeters)),
                    x_axis: Point3d::new(1.0, 0.0, 0.0, None),
                    y_axis: Point3d::new(0.0, 1.0, 0.0, None),
                    z_axis: Point3d::new(0.0, 0.0, 1.0, None),
                },
            ),
            (
                PlaneName::NegXy,
                PlaneInfo {
                    origin: Point3d::new( 0.0, 0.0,  0.0, Some(UnitLength::Millimeters)),
                    x_axis: Point3d::new(-1.0, 0.0,  0.0, None),
                    y_axis: Point3d::new( 0.0, 1.0,  0.0, None),
                    z_axis: Point3d::new( 0.0, 0.0, -1.0, None),
                },
            ),
            (
                PlaneName::Xz,
                PlaneInfo {
                    origin: Point3d::new(0.0,  0.0, 0.0, Some(UnitLength::Millimeters)),
                    x_axis: Point3d::new(1.0,  0.0, 0.0, None),
                    y_axis: Point3d::new(0.0,  0.0, 1.0, None),
                    z_axis: Point3d::new(0.0, -1.0, 0.0, None),
                },
            ),
            (
                PlaneName::NegXz,
                PlaneInfo {
                    origin: Point3d::new( 0.0, 0.0, 0.0, Some(UnitLength::Millimeters)),
                    x_axis: Point3d::new(-1.0, 0.0, 0.0, None),
                    y_axis: Point3d::new( 0.0, 0.0, 1.0, None),
                    z_axis: Point3d::new( 0.0, 1.0, 0.0, None),
                },
            ),
            (
                PlaneName::Yz,
                PlaneInfo {
                    origin: Point3d::new(0.0, 0.0, 0.0, Some(UnitLength::Millimeters)),
                    x_axis: Point3d::new(0.0, 1.0, 0.0, None),
                    y_axis: Point3d::new(0.0, 0.0, 1.0, None),
                    z_axis: Point3d::new(1.0, 0.0, 0.0, None),
                },
            ),
            (
                PlaneName::NegYz,
                PlaneInfo {
                    origin: Point3d::new( 0.0,  0.0, 0.0, Some(UnitLength::Millimeters)),
                    x_axis: Point3d::new( 0.0, -1.0, 0.0, None),
                    y_axis: Point3d::new( 0.0,  0.0, 1.0, None),
                    z_axis: Point3d::new(-1.0,  0.0, 0.0, None),
                },
            ),
        ]);
}

#[derive(Default, Debug)]
pub struct EngineStats {
    pub commands_batched: AtomicUsize,
    pub batches_sent: AtomicUsize,
}

impl Clone for EngineStats {
    fn clone(&self) -> Self {
        Self {
            commands_batched: AtomicUsize::new(self.commands_batched.load(Ordering::Relaxed)),
            batches_sent: AtomicUsize::new(self.batches_sent.load(Ordering::Relaxed)),
        }
    }
}

#[async_trait::async_trait]
pub trait EngineManager: std::fmt::Debug + Send + Sync + 'static {
    /// Get the batch of commands to be sent to the engine.
    fn batch(&self) -> Arc<RwLock<Vec<(WebSocketRequest, SourceRange)>>>;

    /// Get the batch of end commands to be sent to the engine.
    fn batch_end(&self) -> Arc<RwLock<IndexMap<uuid::Uuid, (WebSocketRequest, SourceRange)>>>;

    /// Get the command responses from the engine.
    fn responses(&self) -> Arc<RwLock<IndexMap<Uuid, WebSocketResponse>>>;

    /// Get the ids of the async commands we are waiting for.
    fn ids_of_async_commands(&self) -> Arc<RwLock<IndexMap<Uuid, SourceRange>>>;

    /// Get the async tasks we are waiting for.
    fn async_tasks(&self) -> AsyncTasks;

    /// Take the batch of commands that have accumulated so far and clear them.
    async fn take_batch(&self) -> Vec<(WebSocketRequest, SourceRange)> {
        std::mem::take(&mut *self.batch().write().await)
    }

    /// Take the batch of end commands that have accumulated so far and clear them.
    async fn take_batch_end(&self) -> IndexMap<Uuid, (WebSocketRequest, SourceRange)> {
        std::mem::take(&mut *self.batch_end().write().await)
    }

    /// Take the ids of async commands that have accumulated so far and clear them.
    async fn take_ids_of_async_commands(&self) -> IndexMap<Uuid, SourceRange> {
        std::mem::take(&mut *self.ids_of_async_commands().write().await)
    }

    /// Take the responses that have accumulated so far and clear them.
    async fn take_responses(&self) -> IndexMap<Uuid, WebSocketResponse> {
        std::mem::take(&mut *self.responses().write().await)
    }

    /// Get the default planes.
    fn get_default_planes(&self) -> Arc<RwLock<Option<DefaultPlanes>>>;

    fn stats(&self) -> &EngineStats;

    /// Get the default planes, creating them if they don't exist.
    async fn default_planes(
        &self,
        id_generator: &mut IdGenerator,
        source_range: SourceRange,
    ) -> Result<DefaultPlanes, KclError> {
        {
            let opt = self.get_default_planes().read().await.as_ref().cloned();
            if let Some(planes) = opt {
                return Ok(planes);
            }
        } // drop the read lock

        let new_planes = self.new_default_planes(id_generator, source_range).await?;
        *self.get_default_planes().write().await = Some(new_planes.clone());

        Ok(new_planes)
    }

    /// Helpers to be called after clearing a scene.
    /// (These really only apply to wasm for now).
    async fn clear_scene_post_hook(
        &self,
        id_generator: &mut IdGenerator,
        source_range: SourceRange,
    ) -> Result<(), crate::errors::KclError>;

    async fn clear_queues(&self) {
        self.batch().write().await.clear();
        self.batch_end().write().await.clear();
        self.ids_of_async_commands().write().await.clear();
        self.async_tasks().clear().await;
    }

    /// Fetch debug information from the peer.
    async fn fetch_debug(&self) -> Result<(), crate::errors::KclError>;

    /// Get any debug information (if requested)
    async fn get_debug(&self) -> Option<OkWebSocketResponseData>;

    /// Send a modeling command and do not wait for the response message.
    async fn inner_fire_modeling_cmd(
        &self,
        id: uuid::Uuid,
        source_range: SourceRange,
        cmd: WebSocketRequest,
        id_to_source_range: HashMap<Uuid, SourceRange>,
    ) -> Result<(), crate::errors::KclError>;

    /// Send a modeling command and wait for the response message.
    async fn inner_send_modeling_cmd(
        &self,
        id: uuid::Uuid,
        source_range: SourceRange,
        cmd: WebSocketRequest,
        id_to_source_range: HashMap<uuid::Uuid, SourceRange>,
    ) -> Result<kcmc::websocket::WebSocketResponse, crate::errors::KclError>;

    async fn clear_scene(
        &self,
        id_generator: &mut IdGenerator,
        source_range: SourceRange,
    ) -> Result<(), crate::errors::KclError> {
        // Clear any batched commands leftover from previous scenes.
        self.clear_queues().await;

        self.batch_modeling_cmd(
            id_generator.next_uuid(),
            source_range,
            &ModelingCmd::SceneClearAll(mcmd::SceneClearAll::default()),
        )
        .await?;

        // Flush the batch queue, so clear is run right away.
        // Otherwise the hooks below won't work.
        self.flush_batch(false, source_range).await?;

        // Do the after clear scene hook.
        self.clear_scene_post_hook(id_generator, source_range).await?;

        Ok(())
    }

    /// Ensure a specific async command has been completed.
    async fn ensure_async_command_completed(
        &self,
        id: uuid::Uuid,
        source_range: Option<SourceRange>,
    ) -> Result<OkWebSocketResponseData, KclError> {
        let source_range = if let Some(source_range) = source_range {
            source_range
        } else {
            // Look it up if we don't have it.
            self.ids_of_async_commands()
                .read()
                .await
                .get(&id)
                .cloned()
                .unwrap_or_default()
        };

        let current_time = Instant::now();
        while current_time.elapsed().as_secs() < 60 {
            let responses = self.responses().read().await.clone();
            let Some(resp) = responses.get(&id) else {
                // Yield to the event loop so that we don’t block the UI thread.
                // No seriously WE DO NOT WANT TO PAUSE THE WHOLE APP ON THE JS SIDE.
                #[cfg(target_arch = "wasm32")]
                {
                    let duration = web_time::Duration::from_millis(1);
                    wasm_timer::Delay::new(duration).await.map_err(|err| {
                        KclError::new_internal(KclErrorDetails::new(
                            format!("Failed to sleep: {:?}", err),
                            vec![source_range],
                        ))
                    })?;
                }
                #[cfg(not(target_arch = "wasm32"))]
                tokio::task::yield_now().await;
                continue;
            };

            // If the response is an error, return it.
            // Parsing will do that and we can ignore the result, we don't care.
            let response = self.parse_websocket_response(resp.clone(), source_range)?;
            return Ok(response);
        }

        Err(KclError::new_engine(KclErrorDetails::new(
            "async command timed out".to_string(),
            vec![source_range],
        )))
    }

    /// Ensure ALL async commands have been completed.
    async fn ensure_async_commands_completed(&self) -> Result<(), KclError> {
        // Check if all async commands have been completed.
        let ids = self.take_ids_of_async_commands().await;

        // Try to get them from the responses.
        for (id, source_range) in ids {
            self.ensure_async_command_completed(id, Some(source_range)).await?;
        }

        // Make sure we check for all async tasks as well.
        // The reason why we ignore the error here is that, if a model fillets an edge
        // we previously called something on, it might no longer exist. In which case,
        // the artifact graph won't care either if its gone since you can't select it
        // anymore anyways.
        if let Err(err) = self.async_tasks().join_all().await {
            crate::log::logln!(
                "Error waiting for async tasks (this is typically fine and just means that an edge became something else): {:?}",
                err
            );
        }

        // Flush the batch to make sure nothing remains.
        self.flush_batch(true, SourceRange::default()).await?;

        Ok(())
    }

    /// Set the visibility of edges.
    async fn set_edge_visibility(
        &self,
        visible: bool,
        source_range: SourceRange,
        id_generator: &mut IdGenerator,
    ) -> Result<(), crate::errors::KclError> {
        self.batch_modeling_cmd(
            id_generator.next_uuid(),
            source_range,
            &ModelingCmd::from(mcmd::EdgeLinesVisible { hidden: !visible }),
        )
        .await?;

        Ok(())
    }

    /// Re-run the command to apply the settings.
    async fn reapply_settings(
        &self,
        settings: &crate::ExecutorSettings,
        source_range: SourceRange,
        id_generator: &mut IdGenerator,
        grid_scale_unit: GridScaleBehavior,
    ) -> Result<(), crate::errors::KclError> {
        // Set the edge visibility.
        self.set_edge_visibility(settings.highlight_edges, source_range, id_generator)
            .await?;

        // Send the command to show the grid.

        self.modify_grid(!settings.show_grid, grid_scale_unit, source_range, id_generator)
            .await?;

        // We do not have commands for changing ssao on the fly.

        // Flush the batch queue, so the settings are applied right away.
        self.flush_batch(false, source_range).await?;

        Ok(())
    }

    // Add a modeling command to the batch but don't fire it right away.
    async fn batch_modeling_cmd(
        &self,
        id: uuid::Uuid,
        source_range: SourceRange,
        cmd: &ModelingCmd,
    ) -> Result<(), crate::errors::KclError> {
        let req = WebSocketRequest::ModelingCmdReq(ModelingCmdReq {
            cmd: cmd.clone(),
            cmd_id: id.into(),
        });

        // Add cmd to the batch.
        self.batch().write().await.push((req, source_range));
        self.stats().commands_batched.fetch_add(1, Ordering::Relaxed);

        Ok(())
    }

    // Add a vector of modeling commands to the batch but don't fire it right away.
    // This allows you to force them all to be added together in the same order.
    // When we are running things in parallel this prevents race conditions that might come
    // if specific commands are run before others.
    async fn batch_modeling_cmds(
        &self,
        source_range: SourceRange,
        cmds: &[ModelingCmdReq],
    ) -> Result<(), crate::errors::KclError> {
        // Add cmds to the batch.
        let mut extended_cmds = Vec::with_capacity(cmds.len());
        for cmd in cmds {
            extended_cmds.push((WebSocketRequest::ModelingCmdReq(cmd.clone()), source_range));
        }
        self.stats()
            .commands_batched
            .fetch_add(extended_cmds.len(), Ordering::Relaxed);
        self.batch().write().await.extend(extended_cmds);

        Ok(())
    }

    /// Add a command to the batch that needs to be executed at the very end.
    /// This for stuff like fillets or chamfers where if we execute too soon the
    /// engine will eat the ID and we can't reference it for other commands.
    async fn batch_end_cmd(
        &self,
        id: uuid::Uuid,
        source_range: SourceRange,
        cmd: &ModelingCmd,
    ) -> Result<(), crate::errors::KclError> {
        let req = WebSocketRequest::ModelingCmdReq(ModelingCmdReq {
            cmd: cmd.clone(),
            cmd_id: id.into(),
        });

        // Add cmd to the batch end.
        self.batch_end().write().await.insert(id, (req, source_range));
        self.stats().commands_batched.fetch_add(1, Ordering::Relaxed);
        Ok(())
    }

    /// Send the modeling cmd and wait for the response.
    async fn send_modeling_cmd(
        &self,
        id: uuid::Uuid,
        source_range: SourceRange,
        cmd: &ModelingCmd,
    ) -> Result<OkWebSocketResponseData, crate::errors::KclError> {
        let mut requests = self.take_batch().await.clone();

        // Add the command to the batch.
        requests.push((
            WebSocketRequest::ModelingCmdReq(ModelingCmdReq {
                cmd: cmd.clone(),
                cmd_id: id.into(),
            }),
            source_range,
        ));
        self.stats().commands_batched.fetch_add(1, Ordering::Relaxed);

        // Flush the batch queue.
        self.run_batch(requests, source_range).await
    }

    /// Send the modeling cmd async and don't wait for the response.
    /// Add it to our list of async commands.
    async fn async_modeling_cmd(
        &self,
        id: uuid::Uuid,
        source_range: SourceRange,
        cmd: &ModelingCmd,
    ) -> Result<(), crate::errors::KclError> {
        // Add the command ID to the list of async commands.
        self.ids_of_async_commands().write().await.insert(id, source_range);

        // Fire off the command now, but don't wait for the response, we don't care about it.
        self.inner_fire_modeling_cmd(
            id,
            source_range,
            WebSocketRequest::ModelingCmdReq(ModelingCmdReq {
                cmd: cmd.clone(),
                cmd_id: id.into(),
            }),
            HashMap::from([(id, source_range)]),
        )
        .await?;

        Ok(())
    }

    /// Run the batch for the specific commands.
    async fn run_batch(
        &self,
        orig_requests: Vec<(WebSocketRequest, SourceRange)>,
        source_range: SourceRange,
    ) -> Result<OkWebSocketResponseData, crate::errors::KclError> {
        // Return early if we have no commands to send.
        if orig_requests.is_empty() {
            return Ok(OkWebSocketResponseData::Modeling {
                modeling_response: OkModelingCmdResponse::Empty {},
            });
        }

        let requests: Vec<ModelingCmdReq> = orig_requests
            .iter()
            .filter_map(|(val, _)| match val {
                WebSocketRequest::ModelingCmdReq(ModelingCmdReq { cmd, cmd_id }) => Some(ModelingCmdReq {
                    cmd: cmd.clone(),
                    cmd_id: *cmd_id,
                }),
                _ => None,
            })
            .collect();

        let batched_requests = WebSocketRequest::ModelingCmdBatchReq(ModelingBatch {
            requests,
            batch_id: uuid::Uuid::new_v4().into(),
            responses: true,
        });

        let final_req = if orig_requests.len() == 1 {
            // We can unwrap here because we know the batch has only one element.
            orig_requests.first().unwrap().0.clone()
        } else {
            batched_requests
        };

        // Create the map of original command IDs to source range.
        // This is for the wasm side, kurt needs it for selections.
        let mut id_to_source_range = HashMap::new();
        for (req, range) in orig_requests.iter() {
            match req {
                WebSocketRequest::ModelingCmdReq(ModelingCmdReq { cmd: _, cmd_id }) => {
                    id_to_source_range.insert(Uuid::from(*cmd_id), *range);
                }
                _ => {
                    return Err(KclError::new_engine(KclErrorDetails::new(
                        format!("The request is not a modeling command: {req:?}"),
                        vec![*range],
                    )));
                }
            }
        }

        self.stats().batches_sent.fetch_add(1, Ordering::Relaxed);

        // We pop off the responses to cleanup our mappings.
        match final_req {
            WebSocketRequest::ModelingCmdBatchReq(ModelingBatch {
                ref requests,
                batch_id,
                responses: _,
            }) => {
                // Get the last command ID.
                let last_id = requests.last().unwrap().cmd_id;
                let ws_resp = self
                    .inner_send_modeling_cmd(batch_id.into(), source_range, final_req, id_to_source_range.clone())
                    .await?;
                let response = self.parse_websocket_response(ws_resp, source_range)?;

                // If we have a batch response, we want to return the specific id we care about.
                if let OkWebSocketResponseData::ModelingBatch { responses } = response {
                    let responses = responses.into_iter().map(|(k, v)| (Uuid::from(k), v)).collect();
                    self.parse_batch_responses(last_id.into(), id_to_source_range, responses)
                } else {
                    // We should never get here.
                    Err(KclError::new_engine(KclErrorDetails::new(
                        format!("Failed to get batch response: {response:?}"),
                        vec![source_range],
                    )))
                }
            }
            WebSocketRequest::ModelingCmdReq(ModelingCmdReq { cmd: _, cmd_id }) => {
                // You are probably wondering why we can't just return the source range we were
                // passed with the function. Well this is actually really important.
                // If this is the last command in the batch and there is only one and we've reached
                // the end of the file, this will trigger a flush batch function, but it will just
                // send default or the end of the file as it's source range not the origin of the
                // request so we need the original request source range in case the engine returns
                // an error.
                let source_range = id_to_source_range.get(cmd_id.as_ref()).cloned().ok_or_else(|| {
                    KclError::new_engine(KclErrorDetails::new(
                        format!("Failed to get source range for command ID: {cmd_id:?}"),
                        vec![],
                    ))
                })?;
                let ws_resp = self
                    .inner_send_modeling_cmd(cmd_id.into(), source_range, final_req, id_to_source_range)
                    .await?;
                self.parse_websocket_response(ws_resp, source_range)
            }
            _ => Err(KclError::new_engine(KclErrorDetails::new(
                format!("The final request is not a modeling command: {final_req:?}"),
                vec![source_range],
            ))),
        }
    }

    /// Force flush the batch queue.
    async fn flush_batch(
        &self,
        // Whether or not to flush the end commands as well.
        // We only do this at the very end of the file.
        batch_end: bool,
        source_range: SourceRange,
    ) -> Result<OkWebSocketResponseData, crate::errors::KclError> {
        let all_requests = if batch_end {
            let mut requests = self.take_batch().await.clone();
            requests.extend(self.take_batch_end().await.values().cloned());
            requests
        } else {
            self.take_batch().await
        };

        self.run_batch(all_requests, source_range).await
    }

    async fn make_default_plane(
        &self,
        plane_id: uuid::Uuid,
        info: &PlaneInfo,
        color: Option<Color>,
        source_range: SourceRange,
        id_generator: &mut IdGenerator,
    ) -> Result<uuid::Uuid, KclError> {
        // Create new default planes.
        let default_size = 100.0;

        self.batch_modeling_cmd(
            plane_id,
            source_range,
            &ModelingCmd::from(mcmd::MakePlane {
                clobber: false,
                origin: info.origin.into(),
                size: LengthUnit(default_size),
                x_axis: info.x_axis.into(),
                y_axis: info.y_axis.into(),
                hide: Some(true),
            }),
        )
        .await?;

        if let Some(color) = color {
            // Set the color.
            self.batch_modeling_cmd(
                id_generator.next_uuid(),
                source_range,
                &ModelingCmd::from(mcmd::PlaneSetColor { color, plane_id }),
            )
            .await?;
        }

        Ok(plane_id)
    }

    async fn new_default_planes(
        &self,
        id_generator: &mut IdGenerator,
        source_range: SourceRange,
    ) -> Result<DefaultPlanes, KclError> {
        let plane_opacity = 0.1;
        let plane_settings: Vec<(PlaneName, Uuid, Option<Color>)> = vec![
            (
                PlaneName::Xy,
                id_generator.next_uuid(),
                Some(Color {
                    r: 0.7,
                    g: 0.28,
                    b: 0.28,
                    a: plane_opacity,
                }),
            ),
            (
                PlaneName::Yz,
                id_generator.next_uuid(),
                Some(Color {
                    r: 0.28,
                    g: 0.7,
                    b: 0.28,
                    a: plane_opacity,
                }),
            ),
            (
                PlaneName::Xz,
                id_generator.next_uuid(),
                Some(Color {
                    r: 0.28,
                    g: 0.28,
                    b: 0.7,
                    a: plane_opacity,
                }),
            ),
            (PlaneName::NegXy, id_generator.next_uuid(), None),
            (PlaneName::NegYz, id_generator.next_uuid(), None),
            (PlaneName::NegXz, id_generator.next_uuid(), None),
        ];

        let mut planes = HashMap::new();
        for (name, plane_id, color) in plane_settings {
            let info = DEFAULT_PLANE_INFO.get(&name).ok_or_else(|| {
                // We should never get here.
                KclError::new_engine(KclErrorDetails::new(
                    format!("Failed to get default plane info for: {name:?}"),
                    vec![source_range],
                ))
            })?;
            planes.insert(
                name,
                self.make_default_plane(plane_id, info, color, source_range, id_generator)
                    .await?,
            );
        }

        // Flush the batch queue, so these planes are created right away.
        self.flush_batch(false, source_range).await?;

        Ok(DefaultPlanes {
            xy: planes[&PlaneName::Xy],
            neg_xy: planes[&PlaneName::NegXy],
            xz: planes[&PlaneName::Xz],
            neg_xz: planes[&PlaneName::NegXz],
            yz: planes[&PlaneName::Yz],
            neg_yz: planes[&PlaneName::NegYz],
        })
    }

    fn parse_websocket_response(
        &self,
        response: WebSocketResponse,
        source_range: SourceRange,
    ) -> Result<OkWebSocketResponseData, crate::errors::KclError> {
        match response {
            WebSocketResponse::Success(success) => Ok(success.resp),
            WebSocketResponse::Failure(fail) => {
                let _request_id = fail.request_id;
                if fail.errors.is_empty() {
                    return Err(KclError::new_engine(KclErrorDetails::new(
                        "Failure response with no error details".to_owned(),
                        vec![source_range],
                    )));
                }
                Err(KclError::new_engine(KclErrorDetails::new(
                    fail.errors
                        .iter()
                        .map(|e| e.message.clone())
                        .collect::<Vec<_>>()
                        .join("\n"),
                    vec![source_range],
                )))
            }
        }
    }

    fn parse_batch_responses(
        &self,
        // The last response we are looking for.
        id: uuid::Uuid,
        // The mapping of source ranges to command IDs.
        id_to_source_range: HashMap<uuid::Uuid, SourceRange>,
        // The response from the engine.
        responses: HashMap<uuid::Uuid, BatchResponse>,
    ) -> Result<OkWebSocketResponseData, crate::errors::KclError> {
        // Iterate over the responses and check for errors.
        #[expect(
            clippy::iter_over_hash_type,
            reason = "modeling command uses a HashMap and keys are random, so we don't really have a choice"
        )]
        for (cmd_id, resp) in responses.iter() {
            match resp {
                BatchResponse::Success { response } => {
                    if cmd_id == &id {
                        // This is the response we care about.
                        return Ok(OkWebSocketResponseData::Modeling {
                            modeling_response: response.clone(),
                        });
                    } else {
                        // Continue the loop if this is not the response we care about.
                        continue;
                    }
                }
                BatchResponse::Failure { errors } => {
                    // Get the source range for the command.
                    let source_range = id_to_source_range.get(cmd_id).cloned().ok_or_else(|| {
                        KclError::new_engine(KclErrorDetails::new(
                            format!("Failed to get source range for command ID: {cmd_id:?}"),
                            vec![],
                        ))
                    })?;
                    if errors.is_empty() {
                        return Err(KclError::new_engine(KclErrorDetails::new(
                            "Failure response for batch with no error details".to_owned(),
                            vec![source_range],
                        )));
                    }
                    return Err(KclError::new_engine(KclErrorDetails::new(
                        errors.iter().map(|e| e.message.clone()).collect::<Vec<_>>().join("\n"),
                        vec![source_range],
                    )));
                }
            }
        }

        // Return an error that we did not get an error or the response we wanted.
        // This should never happen but who knows.
        Err(KclError::new_engine(KclErrorDetails::new(
            format!("Failed to find response for command ID: {id:?}"),
            vec![],
        )))
    }

    async fn modify_grid(
        &self,
        hidden: bool,
        grid_scale_behavior: GridScaleBehavior,
        source_range: SourceRange,
        id_generator: &mut IdGenerator,
    ) -> Result<(), KclError> {
        // Hide/show the grid.
        self.batch_modeling_cmd(
            id_generator.next_uuid(),
            source_range,
            &ModelingCmd::from(mcmd::ObjectVisible {
                hidden,
                object_id: *GRID_OBJECT_ID,
            }),
        )
        .await?;

        self.batch_modeling_cmd(
            id_generator.next_uuid(),
            source_range,
            &grid_scale_behavior.into_modeling_cmd(),
        )
        .await?;

        // Hide/show the grid scale text.
        self.batch_modeling_cmd(
            id_generator.next_uuid(),
            source_range,
            &ModelingCmd::from(mcmd::ObjectVisible {
                hidden,
                object_id: *GRID_SCALE_TEXT_OBJECT_ID,
            }),
        )
        .await?;

        Ok(())
    }

    /// Get session data, if it has been received.
    /// Returns None if the server never sent it.
    async fn get_session_data(&self) -> Option<ModelingSessionData> {
        None
    }

    /// Close the engine connection and wait for it to finish.
    async fn close(&self);
}

#[derive(Debug, Hash, Eq, Copy, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, Display, FromStr)]
#[ts(export)]
#[serde(rename_all = "camelCase")]
pub enum PlaneName {
    /// The XY plane.
    #[display("XY")]
    Xy,
    /// The opposite side of the XY plane.
    #[display("-XY")]
    NegXy,
    /// The XZ plane.
    #[display("XZ")]
    Xz,
    /// The opposite side of the XZ plane.
    #[display("-XZ")]
    NegXz,
    /// The YZ plane.
    #[display("YZ")]
    Yz,
    /// The opposite side of the YZ plane.
    #[display("-YZ")]
    NegYz,
}

/// Create a new zoo api client.
#[cfg(not(target_arch = "wasm32"))]
pub fn new_zoo_client(token: Option<String>, engine_addr: Option<String>) -> anyhow::Result<kittycad::Client> {
    let user_agent = concat!(env!("CARGO_PKG_NAME"), ".rs/", env!("CARGO_PKG_VERSION"),);
    let http_client = reqwest::Client::builder()
        .user_agent(user_agent)
        // For file conversions we need this to be long.
        .timeout(std::time::Duration::from_secs(600))
        .connect_timeout(std::time::Duration::from_secs(60));
    let ws_client = reqwest::Client::builder()
        .user_agent(user_agent)
        // For file conversions we need this to be long.
        .timeout(std::time::Duration::from_secs(600))
        .connect_timeout(std::time::Duration::from_secs(60))
        .connection_verbose(true)
        .tcp_keepalive(std::time::Duration::from_secs(600))
        .http1_only();

    let zoo_token_env = std::env::var("ZOO_API_TOKEN");

    let token = if let Some(token) = token {
        token
    } else if let Ok(token) = std::env::var("KITTYCAD_API_TOKEN") {
        if let Ok(zoo_token) = zoo_token_env
            && zoo_token != token
        {
            return Err(anyhow::anyhow!(
                "Both environment variables KITTYCAD_API_TOKEN=`{}` and ZOO_API_TOKEN=`{}` are set. Use only one.",
                token,
                zoo_token
            ));
        }
        token
    } else if let Ok(token) = zoo_token_env {
        token
    } else {
        return Err(anyhow::anyhow!(
            "No API token found in environment variables. Use ZOO_API_TOKEN"
        ));
    };

    // Create the client.
    let mut client = kittycad::Client::new_from_reqwest(token, http_client, ws_client);
    // Set an engine address if it's set.
    let kittycad_host_env = std::env::var("KITTYCAD_HOST");
    if let Some(addr) = engine_addr {
        client.set_base_url(addr);
    } else if let Ok(addr) = std::env::var("ZOO_HOST") {
        if let Ok(kittycad_host) = kittycad_host_env
            && kittycad_host != addr
        {
            return Err(anyhow::anyhow!(
                "Both environment variables KITTYCAD_HOST=`{}` and ZOO_HOST=`{}` are set. Use only one.",
                kittycad_host,
                addr
            ));
        }
        client.set_base_url(addr);
    } else if let Ok(addr) = kittycad_host_env {
        client.set_base_url(addr);
    }

    Ok(client)
}

#[derive(Copy, Clone, Debug)]
pub enum GridScaleBehavior {
    ScaleWithZoom,
    Fixed(Option<kcmc::units::UnitLength>),
}

impl GridScaleBehavior {
    fn into_modeling_cmd(self) -> ModelingCmd {
        const NUMBER_OF_GRID_COLUMNS: f32 = 10.0;
        match self {
            GridScaleBehavior::ScaleWithZoom => ModelingCmd::from(mcmd::SetGridAutoScale {}),
            GridScaleBehavior::Fixed(unit_length) => ModelingCmd::from(mcmd::SetGridScale {
                value: NUMBER_OF_GRID_COLUMNS,
                units: unit_length.unwrap_or(kcmc::units::UnitLength::Millimeters),
            }),
        }
    }
}
